The AI is MUCH MORE crappy than it was in SH3 and SH4 because of some bugs... at the moment it's VERY EASY to slip past DDs or attack ships near them, and the depth charging fails aswell
hopefully the next patch will fix it. I was in Scapa Flow, and from the 4 destroyers that were circling me and attempting a depth charge, 3 ran aground and sank, while the 4th just stopped a few hundred meters behind me and I sank her with 1 torpedo
